NEED ADVICE/help

Mme and my boyfriend were about  to have sex I told him I was on my period but it was my last day.. And he took my tampon out a little.. And didn't push it back in.. We have anal sex.. And idk if he may have released a lil on the outside and some got on the tampon.. And after he push it back in I immediately went and took it out... Is there any chance I could have gotten preganant??????